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Answer:the total cost of the brackets before tax is $89.7Step-by-step explanation:The computation of the total cost of the bracket before tax is as followsGiven thatheight = 9 feetlength = 10 feetwall brackets:48-in costing $12.9560-in costing $16.95The distance of brackets from ends is 1 footThe maximum distance between brackets is 24 inchesNow based on the above informationThe brackets are= 48 ÷ 12= 4 feetAnd= 60 ÷ 12= 5 feetThe length of the shelf is 60 inchNow the 1 could be deducted from each side= 60 - 2= 58 inNow Divide it by 24 inches= 58 ÷ 24= 2.41 ~ 3Finally, The total cost is= ($12.95 + $16.95) × 3= $89.7Hence,the total cost of the brackets before tax is $89.7...

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